I have 2 Rouen duck eggs in a still air incubator. They began rocking on Tuesday night, so per the advice of some experienced duck hatchers, I immediately went into lockdown. Temperature is about 99 degrees, relative humidity is around 75. Today is Saturday and they're still rocking. Do I need to be concerned? This is my first time hatching eggs. I would really appreciate if someone could help me out. I'm in a bit of a panic!